Bicycle MechanicsBroken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

From what I see it is like my Spin Doctor which I just used on my wife's mtn. bike...........you thread the black end into the crank arm threads with the rotating disk end pressing firmly onto the splines in the crank arms. Then you use your supplied wrench and begin to loosen in the proper direction in relation to which side crank arm you are working on. In other words the disk will press against the splines and pull the crank arms from the BB.